//
//  WBNavigationController.swift
//  徐工微博
//
//  Created by ahfu on 2017/4/8.
//  Copyright © 2017年 ahfu. All rights reserved.
//

import UIKit

class WBNavigationController: UINavigationController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        
        //隐藏默认的NavigationBar
        navigationBar.isHidden = true
        
    }

    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        print(viewController)
        //如果不是盏底控制器才需要隐藏 不是不需要隐藏
        if childViewControllers.count > 0 {
            //隐藏底部的tabbar
            viewController.hidesBottomBarWhenPushed = true

        }
        //判断控制器的类型
        if let vc = viewController as? WBBaseViewController {
            var title = "返回"
            //判断控制器的级数
            if childViewControllers.count == 1 {
                title = childViewControllers.first?.title ?? "返回"
            }
            //取出自定义的navItem
            vc.navItem.leftBarButtonItem = UIBarButtonItem(title: title, target: self, action: #selector(popToParent), isBack: true)
        }
        
        super.pushViewController(viewController, animated: true)
    }
    
    @objc private func popToParent() {
        popViewController(animated: true)
    }
}
